This commit removes the code that wrapped legacy fields and widgets
(coming from the legacy registries) into owl components and added
them to the wowl registries. This temporary compatibility layer,
which was incomplete and only allowed us to merge the new views
without converting all fields/widgets in once without breaking
everything, is no longer necessary as we now have converted all of
them into owl components.
X-original-commit: 555959c87e25faa71396f61479e8bb41b66ac164
Part-of: odoo/odoo#102606